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- # frozen_string_literal: true
-
- class Scheduler::FollowRecommendationsScheduler
- include Sidekiq::Worker
- include Redisable
-
- sidekiq_options retry: 0
-
- # The maximum number of accounts that can be requested in one page from the
- # API is 80, and the suggestions API does not allow pagination. This number
- # leaves some room for accounts being filtered during live access
- SET_SIZE = 100
-
- def perform
- # Maintaining a materialized view speeds-up subsequent queries significantly
- AccountSummary.refresh
- FollowRecommendation.refresh
-
- fallback_recommendations = FollowRecommendation.limit(SET_SIZE).index_by(&:account_id)
-
- I18n.available_locales.each do |locale|
- recommendations = begin
- if AccountSummary.safe.filtered.localized(locale).exists? # We can skip the work if no accounts with that language exist
- FollowRecommendation.localized(locale).limit(SET_SIZE).index_by(&:account_id)
- else
- {}
- end
- end
-
- # Use language-agnostic results if there are not enough language-specific ones
- missing = SET_SIZE - recommendations.keys.size
-
- if missing.positive?
- added = 0
-
- # Avoid duplicate results
- fallback_recommendations.each_value do |recommendation|
- next if recommendations.key?(recommendation.account_id)
-
- recommendations[recommendation.account_id] = recommendation
- added += 1
-
- break if added >= missing
- end
- end
-
- redis.pipelined do
- redis.del(key(locale))
-
- recommendations.each_value do |recommendation|
- redis.zadd(key(locale), recommendation.rank, recommendation.account_id)
- end
- end
- end
- end
-
- private
-
- def key(locale)
- "follow_recommendations:#{locale}"
- end
- end
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